[안드로이드 스튜디오 APK] 계산기 Calculator 오픈소스




아래 영상은 밑에 보이는 소스를 응용해서 추가적인 기능을 넣어서 영상을 찍은 것입니다.




기본적인 계산기 소스는 이렇게 짜봤습니다.

activity_main.xml
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<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:weightSum="10">
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_weight="7">
        <TextView
            android:textColor="#000"
            android:textSize="70sp"
            android:textAlignment="viewEnd"
            android:id="@+id/result"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />
    </LinearLayout>
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_weight="3"
        android:background="#5d5d5d"
        android:orientation="horizontal"
        android:weightSum="4">
        <LinearLayout
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:orientation="vertical"
            android:weightSum="4">
            <Button
                android:textSize="30sp"
                android:id="@+id/btn7"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:background="#5d5d5d"
                android:text="7"
                android:textColor="#fff"
                android:textStyle="bold" />
            <Button
                android:textSize="30sp"
                android:id="@+id/btn4"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:background="#5d5d5d"
                android:text="4"
                android:textColor="#fff"
                android:textStyle="bold" />
            <Button
                android:textSize="30sp"
                android:id="@+id/btn1"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:background="#5d5d5d"
                android:text="1"
                android:textColor="#fff"
                android:textStyle="bold" />
            <Button
                android:textSize="30sp"
                android:id="@+id/Plus"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:background="#5d5d5d"
                android:text="+"
                android:textColor="#fff"
                android:textStyle="bold" />
        </LinearLayout>
        <LinearLayout
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:orientation="vertical"
            android:weightSum="4">
            <Button
                android:textSize="30sp"
                android:id="@+id/btn8"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:background="#5d5d5d"
                android:text="8"
                android:textColor="#fff"
                android:textStyle="bold" />
            <Button
                android:textSize="30sp"
                android:id="@+id/btn5"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:background="#5d5d5d"
                android:text="5"
                android:textColor="#fff"
                android:textStyle="bold" />
            <Button
                android:textSize="30sp"
                android:id="@+id/btn2"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:background="#5d5d5d"
                android:text="2"
                android:textColor="#fff"
                android:textStyle="bold" />
            <Button
                android:textSize="30sp"
                android:id="@+id/btn0"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:background="#5d5d5d"
                android:text="0"
                android:textColor="#fff"
                android:textStyle="bold" />
        </LinearLayout>
        <LinearLayout
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:orientation="vertical"
            android:weightSum="4">
            <Button
                android:textSize="30sp"
                android:id="@+id/btn9"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:background="#5d5d5d"
                android:text="9"
                android:textColor="#fff"
                android:textStyle="bold" />
            <Button
                android:textSize="30sp"
                android:id="@+id/btn6"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:background="#5d5d5d"
                android:text="6"
                android:textColor="#fff"
                android:textStyle="bold" />
            <Button
                android:textSize="30sp"
                android:id="@+id/btn3"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:background="#5d5d5d"
                android:text="3"
                android:textColor="#fff"
                android:textStyle="bold" />
            <Button
                android:textSize="30sp"
                android:id="@+id/Minus"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:background="#5d5d5d"
                android:text="-"
                android:textColor="#fff"
                android:textStyle="bold" />
        </LinearLayout>
        <LinearLayout
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:background="#aaaaaa"
            android:orientation="vertical"
            android:weightSum="4">
            <Button
                android:textSize="30sp"
                android:id="@+id/AC"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:background="#e0e0e0"
                android:text="←/AC"
                android:textStyle="bold" />
            <Button
                android:textSize="30sp"
                android:id="@+id/Multiple"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:background="#e0e0e0"
                android:text="x"
                android:textStyle="bold" />
            <Button
                android:textSize="30sp"
                android:id="@+id/Divide"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:background="#e0e0e0"
                android:text="÷"
                android:textStyle="bold" />
            <Button
                android:textSize="30sp"
                android:id="@+id/equal"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:background="#e0e0e0"
                android:text="="
                android:textStyle="bold" />
        </LinearLayout>
    </LinearLayout>
</LinearLayout>
cs





MainActivity.java
import android.content.DialogInterface;
import android.os.Bundle;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
import java.util.Stack;
import java.util.StringTokenizer;
import static com.example.pita.calculator.R.layout.activity_main;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {
    private Button btn1;    private Button btn2;    private Button btn3;    private Button btn4;    private Button btn5;    private Button btn6;    private Button btn7;    private Button btn8;    private Button btn9;    private Button btn0;
    private Button AC;    private Button Plus;    private Button Minus;    private Button Multiple;    private Button Divide;    private Button equal;
    private TextView result;

    @Override    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);        setContentView(activity_main);
        btn1 = (Button) findViewById(R.id.btn1);        btn1.setOnClickListener(this);        btn2 = (Button) findViewById(R.id.btn2);        btn2.setOnClickListener(this);        btn3 = (Button) findViewById(R.id.btn3);        btn3.setOnClickListener(this);        btn4 = (Button) findViewById(R.id.btn4);        btn4.setOnClickListener(this);        btn5 = (Button) findViewById(R.id.btn5);        btn5.setOnClickListener(this);        btn6 = (Button) findViewById(R.id.btn6);        btn6.setOnClickListener(this);        btn7 = (Button) findViewById(R.id.btn7);        btn7.setOnClickListener(this);        btn8 = (Button) findViewById(R.id.btn8);        btn8.setOnClickListener(this);        btn9 = (Button) findViewById(R.id.btn9);        btn9.setOnClickListener(this);        btn0 = (Button) findViewById(R.id.btn0);        btn0.setOnClickListener(this);        AC = (Button) findViewById(R.id.AC);        AC.setOnClickListener(new View.OnClickListener() {
            @Override            public void onClick(View v) {
                if (result.getText().length() != 0) {
                    result.setText(result.getText().subSequence(0, result.getText().length() - 1));                }
            }
        });        AC.setOnLongClickListener(new View.OnLongClickListener() {
            @Override            public boolean onLongClick(View v) {
                if (result.getText().length() != 0) {
                    result.setText("0");                }
                return true;            }
        });        Multiple = (Button) findViewById(R.id.Multiple);        Multiple.setOnClickListener(this);        Divide = (Button) findViewById(R.id.Divide);        Divide.setOnClickListener(this);        Plus = (Button) findViewById(R.id.Plus);        Plus.setOnClickListener(this);        Minus = (Button) findViewById(R.id.Minus);        Minus.setOnClickListener(this);        equal = (Button) findViewById(R.id.equal);        equal.setOnClickListener(this);        result = (TextView) findViewById(R.id.result);    }

    @Override    public void onClick(View v) {
        if (v.equals(btn1)) {
            if (result.getText().length() == 1 && "0".equals(result.getText())) {
                result.setText("1");            } else {
                result.setText(result.getText() + "1");            }
        } else if (v.equals(btn2)) {
            if (result.getText().length() == 1 && "0".equals(result.getText())) {
                result.setText("2");            } else {
                result.setText(result.getText() + "2");            }
        } else if (v.equals(btn3)) {
            if (result.getText().length() == 1 && "0".equals(result.getText())) {
                result.setText("3");            } else {
                result.setText(result.getText() + "3");            }
        } else if (v.equals(btn4)) {
            if (result.getText().length() == 1 && "0".equals(result.getText())) {
                result.setText("4");            } else {
                result.setText(result.getText() + "4");            }
        } else if (v.equals(btn5)) {
            if (result.getText().length() == 1 && "0".equals(result.getText())) {
                result.setText("5");            } else {
                result.setText(result.getText() + "5");            }
        } else if (v.equals(btn6)) {
            if (result.getText().length() == 1 && "0".equals(result.getText())) {
                result.setText("6");            } else {
                result.setText(result.getText() + "6");            }
        } else if (v.equals(btn7)) {
            if (result.getText().length() == 1 && "0".equals(result.getText())) {
                result.setText("7");            } else {
                result.setText(result.getText() + "7");            }
        } else if (v.equals(btn8)) {
            if (result.getText().length() == 1 && "0".equals(result.getText())) {
                result.setText("8");            } else {
                result.setText(result.getText() + "8");            }
        } else if (v.equals(btn9)) {
            if (result.getText().length() == 1 && "0".equals(result.getText())) {
                result.setText("9");            } else {
                result.setText(result.getText() + "9");            }
        } else if (v.equals(btn0)) {
            if (result.getText().length() == 1 && "0".equals(result.getText())) {
                result.setText("0");            } else {
                result.setText(result.getText() + "0");            }
        } else if (v.equals(Divide)) {
            result.setText(result.getText() + "/");        } else if (v.equals(Plus)) {
            result.setText(result.getText() + "+");
        } else if (v.equals(Minus)) {
            result.setText(result.getText() + "-");        } else if (v.equals(Multiple)) {
            result.setText(result.getText() + "*");        } else if (v.equals(equal)) {
            result.setText(Calc(result.getText().toString()));        }
    }

    private String Calc(String str) {
        if (str.indexOf('(') != -1) {
            int fs = str.indexOf('(');            int ls = str.lastIndexOf(')');            String s = Calc(str.substring(fs + 1, ls));            str = str.substring(0, fs) + s + str.substring(ls + 1, str.length());        }

        int cnt = 0;        Stack<Integer> Stk_Num = new Stack<Integer>();        StringTokenizer ST_Num = new StringTokenizer(str, "+-/* ");        StringTokenizer ST_Oper = new StringTokenizer(str, "1234567890 ");
        Stk_Num.push(Integer.parseInt(ST_Num.nextToken()));        while (ST_Num.hasMoreTokens()) {
            char oper = ST_Oper.nextToken().charAt(0);            String num = ST_Num.nextToken();            int a;
            if (oper == '*') {
                a = Stk_Num.pop();                a *= Integer.parseInt(num);                Stk_Num.push(a);            } else if (oper == '/') {
                a = Stk_Num.pop();                a /= Integer.parseInt(num);                Stk_Num.push(a);            } else if (oper == '+') {
                Stk_Num.push(Integer.parseInt(num));            } else if (oper == '-') {
                Stk_Num.push(-1 * (Integer.parseInt(num)));            }
        }

        while (!Stk_Num.isEmpty()) {
            cnt += Stk_Num.pop();        }

        return Integer.toString(cnt);
    }
}

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